I had the same problem with my ATI Radeon Mobility 9000 - 64MB and was a little annoyed, but was going to deal with the intermitant problem (by rebooting when it happened) rather than send my computer in to be fixed, and go without a computer while it was in the shop. Now however, The problem has gotten much much worse. It is to the point where the computer will not boot with anything inteligible on the screen. This renders the computer un-useable. I recommend you do diagnostics on the video card, and send it in to dell to be fixed as soon as possible.